Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5404e66fb07862c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 01:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88a3bcae49d0906ec59550e3f853a361 SHA-1: 549ea3bca5151346c1a9859dff6188cce2f75a99 SHA-256: b5404e66fb07862c0d273b3b94f8caa91bcaed775b67e9f37c48e338dc5417d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://groupkaishan.com/d/files/zowexara.pdf In PDF document text
    • http://satakantaresort.com/user_img/files/9110512456.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/csdsl4aasam5ll8hlqoc1d5ut5/43555491001.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/62302417531.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/junevigupaporinip.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da40e3da2f---vakogotik.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/64610667662.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/21998376132.pdfIn PDF document text
    • http://ausafe.net/images/art/files/vinezemewusanona.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce9dd26df12fc8467237c1180b87051b/84321861089.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/28768804210.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/66322232288.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077073a175d6---kibawudexodomesufekov.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/kaxowedawab.pdfIn PDF document text
    • http://coffee33.ru/archive/file/8223847915.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c9e28705---51992530340.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/wijevuro.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0665a1f89e---6241234613.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f7fd398b---2504024472.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/okv75l0hkkr8cvggj4rtf09lul/kewoxovubafiwoligimi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/e34b9kqbtnrm9pnpdo6tg71o54/guvonujidifumijuwagup.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/36418568744.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/laziropubupogoliz.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/6490053034.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lepusilateji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fruits+drawing+for+colouring+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 16200 bytes
SHA-256: 660426a51a76445e7ef84422600a7361d1afac52108ccf5d00ccc51a52142126
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10828 bytes
SHA-256: 95ab413dc74d8d59fa5705a397fab7177e60dd29161b1a48d0b63162609fe7a2